Features:  Compact in size, lightweight and portable, easy to take out and carry around with you.  Uses high accuracy semiconductor TVOC sensors, with stable working performance, can accurately detect carbon dioxide value.  Adopts electrochemical detection module with stable detection performance, anti-jamming ability, low consumption and can provides long service time.  Large LED display, you can see the electricity quantity, CO2 value, TVOC value, HCHO value, temperature, and humidity clearly.  ℃ and ℉ switchable,  real-time detection, automatic refresh data, with multi-use.  Adopts air convection design, which can provides more accurate detection results.  Equipped with air quality level division function, three different colors correspond to different air quality levels, allowing you to more accurately and more graphic know the current air conditions.  400-1000ppm: the green indicator light blinks, 1001-3000ppm: the orange indicator light blinks, higher than 3000ppm: the red indicator light blinks.  The product does not need calibration, it can be tested after booting, and it can accurately detect carbon dioxide.  Hundreds of ventilation holes reserved on the housing not only accelerate the convection between the air and the machine, thereby realizing effective detection, but also provide a fine heat dissipation effect.  Widely applications: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, business offices, and etc..    Specifications:  Name: Air Quality Detector   Material: ABS  Battery: 1 * built-in lithium battery, 5V, 1200mAh (included)  Display: LED  CO2 measuring ranges: 400ppm-5000ppm  Resolution: 1ppm  Accuracy: ±(50ppm+5% reading)  Temperature measurement ranges: -10.0℃ to 500℃  Resolution: ±1℃  Accuracy: ±1℃  Humidity measurement ranges: 10%RH-99%RH  Resolution: 1%RH  Accuracy: ±5%RH  Working temperature: 0-50℃  Working humidity: 20%RH-90%RH  Item size: 160 * 90 * 41mm / 6.30 * 3.54 * 1.61in  Item weight: 202g / 7.13ounce  Package size: 190 * 120 * 60mm / 7.48 * 4.72 * 2.36in  Package weight: 406g / 14.32ounce    Packing List:  1 * Air Quality Detector  1 * Guideline